Christmas tree



FIG. 1 is a perspective view of a Christmas tree showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof,

FIG. 4 is a left side elevational view thereof,

FIG. 5 is a right side elevational view thereof,

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view to that shown. 

The ornamental design for a Christmas tree, as shown and described. 